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Ambience In addition to the signal produced by the
instruments in an orchestral recording, reverberation caused by
sound reflections from the walls and ceiling of the studio or
concert hall is also picked up by the microphones. When heard
by a listener at the event, the effect is one of spaciousness and
enhancement of the musical sound, but this is not achieved
when heard through a two-channel stereo system, because it is
all reproduced from the narrow frontal stereo stage.
Haffler effect A simple way of extracting reverberation from
the stereo signal and using it to produce a rear ambience
depends on the fact that it is of random phas